From 7ecbcce58aa7a33915a150ad3f48924c1158779d Mon Sep 17 00:00:00 2001
From: Stefan Zabka <zabkaste@hu-berlin.de>
Date: Thu, 11 Jun 2020 18:50:47 +0200
Subject: Basic Implementation

---
 04_exercise/threadpool.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

(limited to '04_exercise/threadpool.c')

diff --git a/04_exercise/threadpool.c b/04_exercise/threadpool.c
index 510e83e..93b8807 100644
--- a/04_exercise/threadpool.c
+++ b/04_exercise/threadpool.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <stdatomic.h>
 
 #define MAX_FUTURES 2048
 typedef struct Thread {
@@ -28,7 +29,7 @@ ThreadPool threadPool;
 /* TODO: interne Hilfsfunktionen hinzufügen */
 void * poolWorkerFunc(void * v_index) {
     size_t index = * (size_t *) v_index;
-    printf("Thread %zu started", index);
+    printf("Thread %zu started \n", index);
     return NULL;
 }
 
@@ -51,8 +52,7 @@ int tpInit(size_t size) {
 void tpRelease(void) {
     for (size_t i = 0; i < threadPool.size; ++i) {
         if (pthread_cancel(threadPool.threads[i].pthread) != 0) {
-            perror("Thread doesn't exist anymore");
-            exit(-1);
+            fprintf(stderr, "The thread %zu had already exited. \n", threadPool.threads[i].index);
         }
     }
     for (size_t i = 0; i < threadPool.size; ++i) {
@@ -66,6 +66,19 @@ void tpRelease(void) {
 
 void tpAsync(Future *future) {
     alPush(&threadPool.al, (void *) future);
+    char expected = FUT_WAITING;
+    if(!atomic_compare_exchange_strong(&future->status, &expected, FUT_IN_PROGRESS )) {
+        perror("The future has been scheduled before");
+        exit(-1);
+    }
+
+    future->fn(future);
+    expected = FUT_IN_PROGRESS;
+    if(!atomic_compare_exchange_strong(&future->status, &expected, FUT_IN_PROGRESS)) {
+        perror("The future got marked as done by another thread");
+        exit(-1);
+    }
+
 }
 
 void tpAwait(Future *future) {
-- 
cgit v1.2.3-54-g00ecf